Total Recall....just noise on ic7 pin 3/4

[Orbis_Ignis]

Ok, I got my Total Recall put together. I can Bias IC6 with either of my MN3005s. But when I try to Bias IC7 as I turn the trimmer there is nothing, then noise, then nothing again. All my voltages check out except for pin5/6/7 of IC4 which are on the high side at -12volts. Now this may be because of where the gain1 trimmer was set at the time of checking the voltages (so that may have changed. Not sure). I do get clean delay signal on pin7 of ic7. Anybody have any ideas?

The real kicker is I just left for vacation and won't be able to play with for a week or so. But I can't quit thinking about it

Edit: dang it. Wrong board

[Orbis_Ignis]

Alright. Back from vacation and back in the saddle a little bit today. It seems like a grounding issue maybe. I can get it to where I can hear some of the delay signal on IC7 when biasing it. Still has quite a bit of noise but it is only on IC7 that I hear it. IC6 is pretty clear. All my voltages look good, but I do not have it in an enclosure. I have it wired the normal way (not true bypass). Anybody have any ideas?

[Orbis_Ignis]

Ok got rid of some of the noise by better grounding. But still when biasing IC7 when I'm turning the trimmer, right when you think you'll hear some repeats, I hear about one and then it gets really distorted.

[Orbis_Ignis]

Almost ready to give up on this one 

I get clean signal trough the effect with it on or off (IC6 biased). If I try to bias IC7, there is noise through the whole circuit. It's like I can hear the first little bit of guitar signal then pulsing noise the get louder with each pulse (on pin 3 & 4 of IC7). Would a bad NE570 cause this? Would the CD4047 cause this on one BBD but not the other?

Now, I have swapped spots for the BBDs and both with the same outcome(can bias the first but all noise on the second). I've switched out all my ICs, but I only have 2 NE570's. It's almost like there is too much gain on the repeats of IC7 but they never stop (it's also the same whether I have a guitar signal going through it or nothing going through it). All my voltages look almost exactly like the build doc. Of course some change when adjusting the trimmers, but I can get all my voltages to look like the build doc.

I will say that when adjusting gain1 I don't hear much of a difference and the volume on IC4 pin7 is lower than IC6 pin3&4 no matter what the setting is. I have changed the gain1 trimmer thinking it might be bad, since I don't hear any difference, but it's still the same.

Any help would be greatly appreciated!

[archaos]

Hmmm, not sure I could be of any help here, still which kind of power supply do you use with it ?

I just ask because I encountered some issues when using 12VDC from my PP2+'s with my Current Lovers. As a matter of fact, using 9VDC from the PS was fine, but when I pushed the dip switches for getting 12VDC, the pedals started to emit a kind of loud "ground noise" (either outputs 1 through 6). Moreover, it was noisy either with a guitar plugged it or not, no differences.
Therefore I tried to power up the pedals @12VDC with a PP Iso 5, then a Power Plant and I got completely rid of that very boring noise.
Soooooooo, I thought that your problem could eventually be the same if you used those outputs with a voltage doubler cable for instance.

[Martan]

Do you have clear signal on pin 7 of IC7? Your jumper from XS to XR looks alright? Can you audio probe from IC6 to IC7?

[joesatch]

you have a close up of the board?

[Orbis_Ignis]

I'm using the suggested power supply from EHX. I get clear signal on pin 7 of IC7. I get clear signal on IC4 pin 6 and 7. It's just when I try to adjust the bias for IC7. It's clear then as I turn it I get a hint of signal then noise. And as I keep turning it then goes back to clear. My jumper from xs to rx looks good. I get signal on both sides of it and reflowed the solder. Maybe I'll redo the jumper just to see

[Martan]

Can't say for sure but almost sounds like your trimmer is bad. I wouldn't do anything until someone else chimes in. Does turning it change any ic voltages?

[Orbis_Ignis]

Well, it changes the voltage but it doesn't really change the volume. Could just be my bad hearing, lol

[Orbis_Ignis]

Here is a pic of the board. It's not pretty since I've done some solder removal than resoldering. Lost some pads

[Orbis_Ignis]

It somehow has to do with the feedback. If I turn the feedback all the way down I can bias IC7. But if I turn it up a little all hell breaks loose.

Edit: I'm getting a huge amount of volume coming out of pin1 of IC4. I mean it is super loud. I don't think it's supposed to be like that. I've got the gain2 trimmer all the down and it's still super loud. I was checking the components around there and the all seem right. Any suggestions?

[Orbis_Ignis]

I think I found my problem. I put in a 680 ohm resistor instead of a 680K ohm resistor   

Now I just have to change it out and see what happens....can't believe I did that 

[Jebus]

I think I found my problem. I put in a 680 ohm resistor instead of a 680K ohm resistor   

Now I just have to change it out and see what happens....can't believe I did that 

Sounds like that probably would cause some problems. A good solder sucker and some solder wick are really good investments.

[Orbis_Ignis]

BTW, That was for R19. Can't wait the change it.